Chapter 03 - Exam practice questions PDF

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Chemistry: The Central Science, 14e (Brown, et al.) Chapter 3 Chemical Reactions and Reaction Stoichiometry 3.1 Multiple-Choice Questions 1) When the following equation is balanced, the coefficients are ________. C8H18 + O2 → CO2 + H2O A) 2, 3, 4, 4 B) 1, 4, 8, 9 C) 2, 12, 8, 9 D) 4, 4, 32, 36 E) 2, 25, 16, 18 Answer: E Diff: 2 Var: 1 LO: 3.1 GO: G2

Page Ref: Sec. 3.1

2) Of the reactions below, which one is not a combination reaction? A) C + O2 → CO2 B) 2Mg + O2 → 2MgO C) 2N2 + 3H2 → 2NH3 D) CaO + H2O → Ca(OH)2 E) 2CH4 + 4O2 → 2CO2 + 4H2O Answer: E Diff: 2 Var: 1 Page Ref: Sec. 3.2 LO: 3.2 GO: G2 3) When a hydrocarbon burns in air, what component of air reacts? A) oxygen B) nitrogen C) carbon dioxide D) water E) argon Answer: A Diff: 2 Var: 1 Page Ref: Sec. 3.2 LO: 3.2 GO: G2

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4) When a hydrocarbon burns in air, a component produced is ________. A) oxygen B) nitrogen C) carbon D) water E) argon Answer: D Diff: 2 Var: 1 Page Ref: Sec. 3.2 LO: 3.2 GO: G2 5) Of the reactions below, which one is a decomposition reaction? A) NH4Cl → NH3 + HCl B) 2Mg + O2 → 2MgO C) 2N2 + 3H2 → 2NH3 D) 2CH4 + 4O2 → 2CO2 + 4H2O E) Cd(NO3)2 + Na2S → CdS + 2NaNO3 Answer: A Diff: 3 Var: 1 Page Ref: Sec. 3.2 LO: 3.2 GO: G2 6) Which one of the following substances is the product of this combination reaction? Al (s) + I2(s) → ________ A) AlI2 B) AlI C) AlI3 D) Al2I3 E) Al3I2 Answer: C Diff: 2 Var: 1 LO: 3.2 GO: G2

Page Ref: Sec. 3.2

7) Which one of the following is not true concerning automotive air bags? A) They are inflated as a result of a decomposition reaction. B) They are loaded with sodium azide initially. C) The gas used for inflating them is oxygen. D) The two products of the decomposition reaction are sodium and nitrogen. E) A gas is produced when the air bag activates. Answer: C Diff: 2 Var: 1 Page Ref: Sec. 3.2 LO: 3.2 GO: G2 2 Copyright © 2018 Pearson Education, Inc.

8) The reaction used to inflate automobile airbags ________. A) produces sodium gas B) is a combustion reaction C) is a combination reaction D) violates the law of conservation of mass E) is a decomposition reaction Answer: E Diff: 2 Var: 1 Page Ref: Sec. 3.2 LO: 3.2 GO: G2 9) Which of the following are combination reactions? 1) CH4 (g) + O2 (g) → CO2 (g) + H2O (l) 2) CaO (s) + CO2 (g) → CaCO3 (s) 3) Mg (s) + O2(g) → MgO (s) 4) PbCO3 (s) → PbO (s) + CO2 (g) A) 1, 2, and 3 B) 2 and 3 C) 1, 2, 3, and 4 D) 4 only E) 2, 3, and 4 Answer: B Diff: 2 Var: 1 Page Ref: Sec. 3.2 LO: 3.2 GO: G2 10) Which of the following are combustion reactions? 1) CH4 (g) + O2 (g) → CO2 (g) + H2O (l) 2) CaO (s) + CO2 (g) → CaCO3 (s) 3) PbCO3 (s) → PbO (s) + CO2 (g) 4) CH3OH (l) + O2 (g) → CO2 (g) + H2O (l) A) 1 and 4 B) 1, 2, 3, and 4 C) 1, 3, and 4 D) 2, 3, and 4 E) 3 and 4 Answer: A Diff: 2 Var: 1 Page Ref: Sec. 3.2 LO: 3.2 GO: G2

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11) Which of the following are decomposition reactions? 1) CH4 (g) + O2 (g) → CO2 (g) + H2O (l) 2) CaO (s) + CO2 (g) → CaCO3 (s) 3) Mg (s) + O2(g) → MgO (s) 4) PbCO3 (s) → PbO (s) + CO2 (g) A) 1, 2, and 3 B) 4 only C) 1, 2, 3, and 4 D) 2 and 3 E) 2, 3, and 4 Answer: B Diff: 2 Var: 1 Page Ref: Sec. 3.2 LO: 3.2 GO: G2 12) The formula of nitrobenzene is C6H5NO2. The molecular weight of this compound is ________ amu. A) 107.11 B) 43.03 C) 109.10 D) 123.11 E) 3.06 Answer: D Diff: 2 Var: 1 Page Ref: Sec. 3.3 LO: 3.3 GO: G4 13) The formula weight of potassium dichromate (K2Cr2O7) is ________ amu. A) 107.09 B) 255.08 C) 242.18 D) 294.18 E) 333.08 Answer: D Diff: 2 Var: 1 Page Ref: Sec. 3.3 LO: 3.3 GO: G4

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14) The formula weight of silver chromate (Ag2CrO4) is ________ amu. A) 159.87 B) 223.87 C) 331.73 D) 339.86 E) 175.87 Answer: C Diff: 2 Var: 1 Page Ref: Sec. 3.3 LO: 3.3 GO: G4 15) The formula weight of ammonium sulfate ((NH4)2SO4), rounded to the nearest integer, is ________ amu. A) 100 B) 118 C) 116 D) 132 E) 264 Answer: D Diff: 2 Var: 1 Page Ref: Sec. 3.3 LO: 3.3 GO: G4 16) The molecular weight of the acetic acid (CH3CO2H), rounded to the nearest integer, is ________ amu. A) 60 B) 48 C) 44 D) 32 Answer: A Diff: 2 Var: 1 Page Ref: Sec. 3.3 LO: 3.3 GO: G4 17) The formula weight of a substance is ________. A) identical to the molar mass B) the same as the percent by mass weight C) determined by combustion analysis D) the sum of the atomic weights of each atom in its chemical formula E) the weight of a sample of the substance Answer: D Diff: 1 Var: 1 Page Ref: Sec. 3.3 LO: 3.3 GO: G2

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18) The formula weight of calcium nitrate (Ca(NO3)2), rounded to one decimal place, is ________ amu. A) 102.1 B) 164.0 C) 204.2 D) 150.1 E) 116.1 Answer: B Diff: 2 Var: 1 Page Ref: Sec. 3.3 LO: 3.3 GO: G4 19) What is the formula weight of magnesium fluoride (MgF2)? A) 86.6 B) 43.3 C) 62.3 D) 67.6 E) 92.9 Answer: C Diff: 2 Var: 1 Page Ref: Sec. 3.3 LO: 3.3 GO: G4 20) What is the formula weight of lead iodide (PbI2)? A) 334.1 B) 168.7 C) 295.6 D) 461.0 E) 668.2 Answer: D Diff: 2 Var: 1 Page Ref: Sec. 3.3 LO: 3.3 GO: G4 21) The mass % of C in methane (CH4) is ________. A) 25.13 B) 133.6 C) 74.87 D) 92.26 E) 7.743 Answer: C Diff: 2 Var: 1 Page Ref: Sec. 3.3 LO: 3.3 GO: G4

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22) The mass % of H in methane (CH4) is ________. A) 25.13 B) 4.032 C) 74.87 D) 92.26 E) 7.743 Answer: A Diff: 2 Var: 1 Page Ref: Sec. 3.3 LO: 3.3 GO: G4 23) The mass % of F in the binary compound KrF2 is ________. A) 18.48 B) 45.38 C) 68.80 D) 81.52 E) 31.20 Answer: E Diff: 2 Var: 1 Page Ref: Sec. 3.3 LO: 3.3 GO: G4 24) Calculate the percentage by mass of nitrogen in PtCl2(NH3)2. A) 4.67 B) 9.34 C) 9.90 D) 4.95 E) 12.67 Answer: B Diff: 2 Var: 1 Page Ref: Sec. 3.3 LO: 3.3 GO: G4 25) Calculate the percentage by mass of lead in Pb(NO3)2. A) 38.6 B) 44.5 C) 62.6 D) 65.3 E) 71.2 Answer: C Diff: 2 Var: 1 Page Ref: Sec. 3.3 LO: 3.3 GO: G4

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26) Calculate the percentage by mass of carbon in CO2. A) 27.29 B) 75.10 C) 73.05 D) 72.71 E) 37.53 Answer: A Diff: 2 Var: 1 Page Ref: Sec. 3.3 LO: 3.3 GO: G4 27) Calculate the percentage by mass of oxygen in Pb(NO3)2. A) 9.7 B) 14.5 C) 19.3 D) 29.0 E) 33.4 Answer: D Diff: 2 Var: 1 Page Ref: Sec. 3.3 LO: 3.3 GO: G4 28) Calculate the percentage by mass of ammonia in cisplatin, PtCl2(NH3)2. A) 5.68 B) 11.35 C) 4.67 D) 12.53 E) 18.09 Answer: B Diff: 3 Var: 1 Page Ref: Sec. 3.3 LO: 3.3 GO: G4 29) Calculate the percentage by mass of hydrogen in PtCl2(NH3)2. A) 1.558 B) 1.008 C) 0.672 D) 0.034 E) 2.016 Answer: E Diff: 3 Var: 1 Page Ref: Sec. 3.3 LO: 3.3 GO: G4

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30) Which of the following contains the largest number of atoms in mole? A) S8 B) C4H10 C) Al2(SO4)3 D) Na3PO4 E) Cl2 Answer: C Diff: 2 Var: 1 Page Ref: Sec. 3.4 LO: 3.4 GO: G4 31) One mole of ________ contains the smallest number of atoms. A) S8 B) C10H8 C) Al2(SO4)3 D) Na3PO4 E) NaCl Answer: E Diff: 1 Var: 1 Page Ref: Sec. 3.4 LO: 3.4 GO: G4 32) One million argon atoms is ________ mol (rounded to two significant figures) of argon atoms. A) 3.0 B) 1.7 × 10-18 C) 6.0 × 1023 D) 1.0 × 10-6 E) 1.0 × 10+6 Answer: B Diff: 2 Var: 1 Page Ref: Sec. 3.4 LO: 3.5 GO: G4 33) How many molecules of CH4 are in 48.2 g of this compound? A) 5.00 × 10-24 B) 2.00 × 1023 C) 4.64 × 1026 D) 1.81 × 1024 E) 4.00 Answer: D Diff: 3 Var: 1 Page Ref: Sec. 3.4 LO: 3.5 GO: G4 9 Copyright © 2018 Pearson Education, Inc.

34) A 30.5 gram sample of glucose (C6H12O6) contains ________ mol of glucose. A) 0.424 B) 0.169 C) 5.90 D) 2.36 E) 0.136 Answer: B Diff: 2 Var: 1 Page Ref: Sec. 3.4 LO: 3.4 GO: G4 35) A sample of CH2F2 with a mass of 19 g contains ________ atoms of F. A) 2.2 × 1023 B) 38 C) 3.3 × 1024 D) 4.4 × 1023 E) 9.5 Answer: D Diff: 3 Var: 1 Page Ref: Sec. 3.4 LO: 3.5 GO: G4 36) A sample of CH4O with a mass of 32.0 g contains ________ molecules of CH4O. A) 5.32 × 10-23 B) 1.00 C) 1.88 × 1022 D) 6.02 × 1023 E) 32.0 Answer: D Diff: 2 Var: 1 Page Ref: Sec. 3.4 LO: 3.5 GO: G4 37) How many atoms of nitrogen are in 10 g of NH4NO3? A) 3.5 B) 1.5 × 1023 C) 3.0 × 1023 D) 1.8 E) 2 Answer: B Diff: 3 Var: 1 Page Ref: Sec. 3.4 LO: 3.5 GO: G4

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38) Gaseous neon has a density of 0.900 g/L at standard conditions. How many neon atoms are in 1.00 L of neon gas at standard conditions? A) 5.42 × 1023 B) 1.35 × 1025 C) 7.41 × 10-26 D) 2.69 × 1022 E) 6.02 × 1023 Answer: D Diff: 4 Var: 1 Page Ref: Sec. 3.4 LO: 3.5 GO: G4 39) How many oxygen atoms are contained in 2.74 g of Al2(SO4)3? A) 12 B) 6.02 × 1023 C) 7.22 × 1024 D) 5.79 × 1022 E) 8.01 × 10-3 Answer: D Diff: 3 Var: 1 Page Ref: Sec. 3.4 LO: 3.5 GO: G4 40) What is the total number of atoms in 0.139 mol of Fe(OH2)63+? A) 19.0 B) 1.59 × 1024 C) 8.37 × 1022 D) 2.64 E) 1.84 × 1024 Answer: B Diff: 3 Var: 1 Page Ref: Sec. 3.4 LO: 3.5 GO: G4 41) How many sulfur dioxide molecules are there in 1.80 mol of sulfur dioxide? A) 1.08 × 1023 B) 6.02 × 1024 C) 1.80 × 1024 D) 1.08 × 1024 E) 6.02 × 1023 Answer: D Diff: 2 Var: 1 Page Ref: Sec. 3.4 LO: 3.5 GO: G4 11 Copyright © 2018 Pearson Education, Inc.

42) How many sulfur dioxide molecules are there in 0.180 mol of sulfur dioxide? A) 1.80 × 1023 B) 6.02 × 1024 C) 6.02 × 1023 D) 1.08 × 1024 E) 1.08 × 1023 Answer: E Diff: 2 Var: 1 Page Ref: Sec. 3.4 LO: 3.5 GO: G4 43) How many carbon atoms are there in 52.06 g of carbon dioxide? A) 5.206 × 1024 B) 3.134 × 1025 C) 7.122 × 1023 D) 8.648 × 10-23 E) 1.424 × 1024 Answer: C Diff: 3 Var: 1 Page Ref: Sec. 3.4 LO: 3.5 GO: G4 44) How many oxygen atoms are there in 52.06 g of carbon dioxide? A) 1.424 × 1024 B) 6.022 × 1023 C) 7.122 × 1023 D) 5.088 × 1023 E) 1.018 × 1024 Answer: A Diff: 3 Var: 1 Page Ref: Sec. 3.4 LO: 3.5 GO: G4 45) How many moles of sodium carbonate contain 1.773 × 1017 carbon atoms? A) 5.890 × 10-7 B) 2.945 × 10-7 C) 1.473 × 10-7 D) 8.836 × 10-7 E) 9.817 × 10-8 Answer: B Diff: 2 Var: 1 Page Ref: Sec. 3.4 LO: 3.5 GO: G4 12 Copyright © 2018 Pearson Education, Inc.

46) How many grams of sodium carbonate contain 1.773 × 1017 carbon atoms? A) 3.121 × 10-5 B) 1.011 × 10-5 C) 1.517 × 10-5 D) 9.100 × 10-5 E) 6.066 × 10-5 Answer: A Diff: 2 Var: 1 Page Ref: Sec. 3.4 LO: 3.5 GO: G4 47) The compound responsible for the characteristic smell of garlic is allicin, C6H10OS2. What is the mass (g) of 1.00 mol of allicin? A) 34 B) 162 C) 86 D) 61 E) 19 Answer: B Diff: 1 Var: 1 Page Ref: Sec. 3.4 LO: 3.4 GO: G7 48) The molecular formula of aspartame, the generic name of NutraSweet®, is C14H18N2O5. What is the mass (g) of 1.00 mol of aspartame? A) 24 B) 156 C) 294 D) 43 E) 39 Answer: C Diff: 1 Var: 1 Page Ref: Sec. 3.4 LO: 3.4 GO: G7

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49) There are ________ oxygen atoms in 30 molecules of C20H42S3O2. A) 6.0 × 1023 B) 1.8 × 1025 C) 3.6 × 1025 D) 1.2 × 1024 E) 60 Answer: E Diff: 2 Var: 1 Page Ref: Sec. 3.4 LO: 3.5 GO: G4 50) A nitrogen oxide is 63.65% by mass nitrogen. The molecular formula could be ________. A) NO B) NO2 C) N2O D) N2O4 E) either NO2 or N2O4 Answer: C Diff: 3 Var: 1 Page Ref: Sec. 3.5 LO: 3.6 GO: G2 51) A sulfur oxide is 50.0% by mass sulfur. This molecular formula could be ________. A) SO B) SO2 C) S2O D) S2O4 E) either SO2 or S2O4 Answer: E Diff: 3 Var: 1 Page Ref: Sec. 3.5 LO: 3.6 GO: G2 52) Which hydrocarbon pair below has identical mass percentage of C? A) C3H4 and C3H6 B) C2H4 and C3H4 C) C2H4 and C4H2 D) C2H4 and C3H6 E) none of the above Answer: D Diff: 3 Var: 1 Page Ref: Sec. 3.5 LO: 3.6 GO: G2

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53) Propane (C3H8) reacts with oxygen in the air to produce carbon dioxide and water. In a particular experiment, 38.0 grams of carbon dioxide are produced from the reaction of 22.05 grams of propane with excess oxygen. What is the % yield in this reaction? A) 38.0 B) 57.6 C) 66.0 D) 86.4 E) 94.5 Answer: B Diff: 5 Var: 1 Page Ref: Sec 3.7 LO: 3.8 GO: G4 3.2 Bimodal Questions 1) When the following equation is balanced, the coefficients are ________. NH3 (g) + O2 (g) → NO2 (g) + H2O (g) A) 1, 1, 1, 1 B) 4, 7, 4, 6 C) 2, 3, 2, 3 D) 1, 3, 1, 2 E) 4, 3, 4, 3 Answer: B Diff: 2 Var: 1 LO: 3.1 GO: G4

Page Ref: Sec. 3.1

2) When the following equation is balanced, the coefficients are ________. Al(NO3)3 + Na2S → Al2S3 + NaNO3 A) 2, 3, 1, 6 B) 2, 1, 3, 2 C) 1, 1, 1, 1 D) 4, 6, 3, 2 E) 2, 3, 2, 3 Answer: A Diff: 2 Var: 1 LO: 3.1 GO: G2

Page Ref: Sec. 3.1

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3) When the following equation is balanced, the coefficient of H2 is ________. K (s) + H2O (l) → KOH (aq) + H2 (g) A) 1 B) 2 C) 3 D) 4 E) 5 Answer: A Diff: 2 Var: 1 LO: 3.1 GO: G2

Page Ref: Sec. 3.1

4) When the following equation is balanced, the coefficient of Al is ________. Al (s) + H2O (l) → Al(OH (s) + H2 (g)

A) 1 B) 2 C) 3 D) 5 E) 4 Answer: B Diff: 2 Var: 1 LO: 3.1 GO: G2

Page Ref: Sec. 3.1

5) When the following equation is balanced, the coefficient of H2O is ________. Ca (s) + H2O (l) → Ca(OH)2 (aq) + H2 (g) A) 1 B) 2 C) 3 D) 5 E) 4 Answer: B Diff: 2 Var: 1 LO: 3.1 GO: G2

Page Ref: Sec. 3.1

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6) When the following equation is balanced, the coefficient of Al2O3 is ________. Al2O3 (s) + C (s) + Cl2 (g) → AlCl3 (s) + CO (g) A) 1 B) 2 C) 3 D) 4 E) 5 Answer: A Diff: 2 Var: 1 LO: 3.1 GO: G2

Page Ref: Sec. 3.1

7) When the following equation is balanced, the coefficient of H2S is ________. FeCl3 (aq) + H2S (g) → Fe2S3 (s) + HCl (aq) A) 1 B) 2 C) 3 D) 5 E) 4 Answer: C Diff: 2 Var: 1 LO: 3.1 GO: G2

Page Ref: Sec. 3.1

8) When the following equation is balanced, the coefficient of HCl is ________. CaCO3 (s) + HCl (aq) → CaCl2 (aq) + CO2 (g) + H2O (l) A) 1 B) 2 C) 3 D) 4 E) 0 Answer: B Diff: 2 Var: 1 LO: 3.1 GO: G2

Page Ref: Sec. 3.1

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9) When the following equation is balanced, the coefficient of HNO3 is ________. HNO3 (aq) + CaCO3 (s) → Ca(NO3)2 (aq) + CO2 (g) + H2O (l) A) 1 B) 2 C) 3 D) 5 E) 4 Answer: B Diff: 2 Var: 1 LO: 3.1 GO: G2

Page Ref: Sec. 3.1

10) When the following equation is balanced, the coefficient of H3PO4 is ________. H3PO4 (aq) + NaOH (aq) → Na3PO4 (aq) + H2O (l) A) 1 B) 2 C) 3 D) 4 E) 0 Answer: A Diff: 2 Var: 1 LO: 3.1 GO: G2

Page Ref: Sec. 3.1

11) When the following equation is balanced, the coefficient of C3H8O3 is ________. C3H8O3 (g) + O2 (g) → CO2 (g) + H2O (g) A) 1 B) 2 C) 3 D) 7 E) 5 Answer: B Diff: 2 Var: 1 LO: 3.1 GO: G2

Page Ref: Sec. 3.1

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12) When the following equation is balanced, the coefficient of O2 is ________. C2H4O (g) + O2 (g) → CO2 (g) + H2O (g) A) 2 B) 3 C) 4 D) 5 E) 1 Answer: D Diff: 2 Var: 1 LO: 3.1 GO: G2

Page Ref: Sec. 3.1

13) Balance the following reaction and determine the coefficient of H 2O. CO (g) + H2 (g) → H2O (g) + CH4 (g) A) 1 B) 2 C) 3 D) 4 E) 0 Answer: A Diff: 2 Var: 1 LO: 3.1 GO: G2

Page Ref: Sec. 3.1

14) When the following equation is balanced, the coefficient of H2SO4 is ________. H2SO4 (aq) + NaOH (aq) → Na2SO4 (aq) + H2O (l) A) 1 B) 2 C) 3 D) 4 E) 0.5 Answer: A Diff: 2 Var: 1 LO: 3.1 GO: G2

Page Ref: Sec. 3.1

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15) When the following equation is balanced, the coefficient of water is ________. K (s) + H2O (l) → KOH (aq) + H2 (g) A) 1 B) 2 C) 3 D) 4 E) 5 Answer: B Diff: 2 Var: 1 LO: 3.1 GO: G2

Page Ref: Sec. 3.1

16) Balance the following reaction and determine the coefficient of potassium hydroxide. K (s) + H2O (l) → KOH (aq) + H2 (g) A) 1 B) 2 C) 3 D) 4 E) 5 Answer: B Diff: 2 Var: 1 LO: 3.1 GO: G2

Page Ref: Sec. 3.1

17) When the following equation is balanced, the coefficient of oxygen is ________. PbS (s) + O2 (g) → PbO (s) + SO2 (g) A) 1 B) 3 C) 2 D) 4 E) 5 Answer: B Diff: 2 Var: 1 LO: 3.1 GO: G2

Page Ref: Sec. 3.1

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18) When the following equation is balanced, the coefficient of sulfur dioxide is ________. PbS (s) + O2 (g) → PbO (s) + SO2 (g) A) 5 B) 1 C) 3 D) 2 E) 4 Answer: D Diff: 2 Var: 1 LO: 3.1 GO: G2

Page Ref: Sec. 3.1

19) When the following equation is balanced, the coefficient of dinitrogen pentoxide is ________. N2O5 (g) + H2O (l) → HNO3 (aq) A) 1 B) 2 C) 3 D) 4 E) 5 Answer: A Diff: 2 Var: 1 LO: 3.1 GO: G2

Page Ref: Sec. 3.1

20) When the following equation is balanced, the coefficient of water is ________. N2O5 (g) + H2O (l) → HNO3 (aq) A) 5 B) 2 C) 3 D) 4 E) 1 Answer: E Diff: 2 Var: 1 LO: 3.1 GO: G2

Page Ref: Sec. 3.1

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21) Balance the following reaction and determine the coefficient of nitric acid. N2O5 (g) + H2O (l) → HNO3 (aq) A) 5 B) 2 C) 3 D) 4 E) 1 Answer: B Diff: 2 Var: 1 LO: 3.1 GO: G2

Page Ref: Sec. 3.1

22) Write the balanced equation for the reaction that occurs when methanol, CH3OH (l), is burned in air. What is the coefficient of methanol in the balanced equation? A) 1 B) 2 C) 3 D) 4 E) 3/2 Answer: B Diff: 3 Var: 1 Page Ref: Sec. 3.2 LO: 3.2 GO: G2 23) Write the balanced equation for the reaction that occurs when butane undergoes combustion. What is the coefficient of oxygen in the balanced equation? A) 10 B) 8 C) 13 D) 4 E) 13/2 Answer: C Diff: 3 Var: 1 Page Ref: Sec. 3.2 LO: 3.2 GO: G2

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24) What is the coefficient of O2 when the following equation is completed and balanced? C4H8O2 + O2 → ________ A) 2 B) 3 C) 5 D) 6 E) 1 Answer: C Diff: 3 Var: 1 LO: 3.2 GO: G4

Page Ref: Sec. 3.2

25) Predict the product in the combination reaction below. Al (s) + N2 (g) → ________ A) AlN B) Al3N C) AlN2 D) Al3N2 E) AlN3 Answer: A Diff: 3 Var: 1 LO: 3.2 GO: G2

Page Ref: Sec. 3.2

26) The balanced equation for the decomposition of sodium azide is ________. A) 2NaN3 (s) → 2Na (s) + 3N2 (g) B) 2NaN3 (s) → Na2 (s) + 3N2 (g) C) NaN3 (s) → Na (s) + N2 (g) D) NaN3 (s) → Na (s) + N2 (g) + N (g) E) 2NaN3 (s) → 2Na (s) + 2N2 (g) Answer: A Diff: 2 Var: 1 Page Ref: Sec. 3.2 LO: 3.2 GO: G2

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27) There are ________ mol of carbon atoms in 4 mol of C4H8O2. A) 4 B) 8 C) 16 D) 20 E) 32 Answer: C Diff: 1 Var: 1 Page Ref: Sec. 3.4 LO: 3.4 GO: G4 28) There are ________ sulfur atoms in 25 molecules of C4H4S2. A) 1.5 × 1025 B) 4.8 × 1025 C) 3.0 × 1025 D) 50 E) 6.02 × 1023 Answer: D Diff: 2 Var: 1 Page Ref: Sec. 3.4 LO: 3.4 GO: G4 29) There are ________ hydrogen atoms in 25 molecules of C4H4S2. A) 25 B) 3.8 × 1024 C) 6.0 × 1025 D) 100 E) 1.5 × 1025 Answer: D Diff: 2 Var: 1 Page Ref: Sec. 3.4 LO: 3.4 GO: G4 30) A sample of C3H8O that contains 200 molecules contains ________ carbon atoms. A) 600 B) 200 C) 3.61 × 1026 D) 1.20 × 1026 E) 4.01 × 1025 Answer: A Diff: 2 Var: 1 Page Ref: Sec. 3.4 LO: 3.4 GO: G4

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31) How many moles of carbon monoxide are there in 36.55 g of carbon monoxide? A) 1.023 B) 1.305 C) 0.8307 D) 0.7761 E) 1023 Answer: B Diff: 2 Var: 1 Page Ref: Sec. 3.4 LO: 3.4 GO: G4 32) How many moles of carbon dioxide are there in 52.06 g of carbon dioxide? A) 0.8452 B) 1.183 C) 6.022 × 1023 D) 8.648 × 1023 E) 3.134 × 1025 Answer: B Diff: 2 Var: 1 Page Ref: Sec. 3.4 LO: 3.4 GO: G4 33) There are ________ molecules of methane in 0.123 mol of methane (CH4). A) 5 B) 2.46 × 10-2 C) 2.04 × 10-25 D) 7.40 × 1022 E) 0.615 Answer: D Diff: 2 Var: 1 Page Ref: Sec. 3.4 LO: 3.5 GO: G4 34) Wh...